Article
Mathematics, Interdisciplinary Applications
Tongjun Miao, Aimin Chen, Xiaoya Yang, Boming Yu
Summary: This study proposes a generalized stress-dependent model for permeability of porous rocks based on fractal geometry theory and mechanics of porous rock. The model takes into account pore structure parameters and material elastic constants of porous rocks, and can accurately describe the effect of pore structures on the coupled hydromechanical process.
FRACTALS-COMPLEX GEOMETRY PATTERNS AND SCALING IN NATURE AND SOCIETY
(2023)
Review
Engineering, Chemical
Panpan Li, Cui Ma, Zhenqian Chen, Haoqi Wang, Yu Wang, Hao Bai
Summary: This study focuses on the heat and moisture transfer process in deformable porous media and investigates the enhancement mechanism and effects of ultrasound. A mathematical model is developed to analyze the macroscopic deformations and optimize the parameters of the ultrasound-assisted drying system.
Article
Mathematics, Interdisciplinary Applications
Tongjun Miao, Aimin Chen, Yan Xu, Sujun Cheng, Liwei Zhang, Changbin Yan, Boming Yu
Summary: This study proposes analytical models for the dimensionless relative permeabilities of wetting and non-wetting phases flow in porous-fracture media based on fractal geometry theory. The results reveal that the ratio between porous matrix and fracture significantly affects the relative permeabilities and total saturations of wetting phases.
FRACTALS-COMPLEX GEOMETRY PATTERNS AND SCALING IN NATURE AND SOCIETY
(2021)
Article
Thermodynamics
Feifan Huang, Weijun Liu, Shuhua Zhang, Shaoai Chen, Furao Ren
Summary: This paper develops a multi-phase porous media heat and mass transfer model, which accurately calculates the thermal desorption characteristics of mixed adsorbates in spent activated carbon and considers the presence of residual adsorbates. The feasibility of the model is verified by comparing computational simulation results with experimental results. The study reveals the temperature rise and liquid phase content characteristics of the spent activated carbon samples under constant heating conditions, as well as the dominance of vapor flow in the fluid flow within the thermally regenerated samples. Additionally, the design and comparison of different regeneration samples result in significant time savings for thermal regeneration of spent activated carbon.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Engineering, Chemical
Jhony T. Teleken, Marintho B. Quadri, Antonio P. N. Oliveira, Joao B. Laurindo, Ashim K. Datta, Bruno A. M. Carciofi
Summary: This study proposed a mathematical model for describing the drying process of porous media under microwave heating in a vacuum, validated through experiments on ceramic samples. The research found that drainage is the primary mode of transport in microwave vacuum drying, with the evaporation rate constant identified as a key parameter affecting drying kinetics.
Article
Geosciences, Multidisciplinary
Yuehongjiang Yu, Chuanxi Wang, Junning Liu, Sheng Mao, Yashar Mehmani, Ke Xu
Summary: Bubbles in subsurface porous media coarsen to reduce free energy and this process significantly impacts various geophysical problems. The coarsening kinetics in porous media deviate from classical theory due to quantization of space and re-scaling of mass transfer coefficient. A new coarsening theory is proposed and validated through numerical simulations. This work enhances the understanding of complex fluid behaviors in subsurface environments.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Engineering, Chemical
Licheng Wang, Yijing Lu, Yu Qi, Mengya Wang
Summary: The study investigated the heat and mass transfer in porous media using carbon fiber as the medium. Experimental and simulation results showed that feed pressure and liquid viscosity have significant effects on the heat and mass transfer processes.
Article
Engineering, Chemical
Mubarak Khlewee, William J. DeSisto, Douglas W. Bousfield
Summary: Understanding the dynamic fluid flow in a porous media with temperature changes is important for various applications. This study developed a model based on Darcy's law to quantify the penetration of hot melt adhesive into paper and proposed a model that considers process and material parameters. Experiments were conducted to validate the model, and the results showed good agreement. The permeability of the coating layer and the paper temperature were identified as key parameters influencing penetration depth.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Thermodynamics
Yueqiang Zhu, Peng Wang, Dongliang Sun, Zhiguo Qu, Bo Yu
Summary: This study established a multiphase porous media model considering the shrinkage effect, validated its accuracy in food convective drying, compared it with traditional models, showing faster moisture content decrease and higher evaporation rate.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Mathematics, Interdisciplinary Applications
Qun Han, Chengbin Zhang, Yongping Chen
Summary: In this study, an innovative venation-finned porous network is employed to enhance the melting performance of phase change materials (PCMs). The venation-finned porous network is quantitatively described and optimized, and the effects of branching angle and Murray coefficient on melting performance are comprehensively studied. The results show that the venation-finned porous network is favorable to improve the melting performance, and the optimal branching angle and Murray coefficient can maximize the melting efficiency.
FRACTALS-COMPLEX GEOMETRY PATTERNS AND SCALING IN NATURE AND SOCIETY
(2022)
Article
Physics, Applied
Pramod Kumar Yadav, Ankit Kumar, Ali J. Chamkha
Summary: This study investigates the impact of radiative heat and mass transfer with inclined magnetic field on thermal exchange and entropy production in a static porous saturated conduit with two immiscible nature of electrically conducting couple stress fluid. The results show that increasing the couple stress parameter enhances the velocity, entropy production, and thermal profile of the immiscible couple stress fluid in the porous channel. On the other hand, increasing the Hartmann number and decreasing the permeability of the porous region lead to a decrease in thermal properties and entropy production. Additionally, the concentration field and Bejan number distribution of the couple stress fluids decrease with increasing Soret number and Schmidt number. The research findings are consistent with previous work and have potential applications in food processing, petroleum products, and chemical processes.
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
(2023)
Article
Energy & Fuels
Vikas Chaurasiya, Jitendra Singh
Summary: The paper discusses the coupled heat and mass transfer problem in freeze-drying of a porous body, taking into account convection and the convective term due to water vapor. Through mathematical modeling and graphical illustration, the effects of various parameters on thermal properties are studied. The results show that the presence of convection speeds up the freeze-drying process, but also hinders it by increasing the rate of water vaporization.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Thermodynamics
Teerapot Wessapan, Phadungsak Rattanadecho
Summary: High-intensity focused ultrasound (HIFU) is a non-invasive treatment method that uses focused ultrasound waves to target specific tissues. This study investigated the impact of tumor porosity, acoustic operating frequency, and the tumor acoustic absorption coefficient on fluid flow and temperature distribution during HIFU exposure. Numerical models were used to calculate acoustic wave propagation, fluid flow, and heat transfer processes in the porous tumor. The study found that maximal temperature increase might not always occur at the acoustic pressure focus if the tumor has higher porosity than the neighboring normal tissue.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Engineering, Chemical
Graham Thorpe
Summary: The thermal performance of ventilated beds of hygroscopic porous media is closely related to the sorption properties of the solid phase. The predicted performance of such beds is highly sensitive to the form and accuracy of the sorption isotherm. When using Toth's isotherm in an equilibrium model to analyze the performance of a bed of warm and dry silica gel ventilated with cool, humid air, a shock wave is predicted to develop downstream of the air entering the bed. However, non-equilibrium solutions show a transfer wave instead, with a width that decreases as the velocity of the interstitial air decreases.
TRANSPORT IN POROUS MEDIA
(2023)
Article
Thermodynamics
Samah A. Ali, Munyaradzi Rudziva, Precious Sibanda, Osman A. I. Noreldin, Sicelo P. Goqo, Hloniphile Sithole Mthethwa
Summary: This article investigates double-diffusive convection in a non-uniformly rotating anisotropic fluid layer with internal heating. The critical Rayleigh numbers for both stationary and oscillatory modes are obtained using the normal mode technique. Nonlinear analysis is performed using a minimal truncated double Fourier series, which leads to nonlinear Lorenz type equations. The coupled equations are solved using a local quasilinearization block hybrid method (LQBHM) and the results are compared with those obtained using the ode45 solver. The numerical results demonstrate that the LQBHM is accurate, efficient, and flexible. A weakly nonlinear analysis is used to study the rate of heat and mass transfer in the fluid system, and graphical representations illustrate the effects of various parameters. The findings suggest that rotational modulation amplitude and internal heating enhance the rate of heat and mass transfer, thereby advancing the onset of thermal convection in the system.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Mahsa Taghavi, Swapnil Sharma, Vemuri Balakotaiah
Summary: This study investigates the natural convection effects in the insulation layers of spherical storage tanks and their impact on the tanks' performance. The permeability and Rayleigh number of the insulation material are considered as key factors. The results show that as the Rayleigh number increases, new convective cells emerge and cause the cold boundary to approach the external hot boundary. In the case of large temperature differences, multiple solutions may coexist.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Jinyang Xu, Fangjun Hong, Chaoyang Zhang
Summary: This study introduces a self-induced jet impingement device for enhancing pool boiling performance in high power electronic cooling. Through visualization and parametric investigations, the effects of this device on pool boiling performance are studied, revealing the promotion of additional liquid supply and vapor exhausting. The flow rate of the liquid jet is found to positively impact boiling performance.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Wenchao Ke, Yuan Liu, Fissha Biruke Teshome, Zhi Zeng
Summary: Underwater wet laser welding (UWLW) is a promising and labor-saving repair technique. A thermal multi-phase flow model was developed to study the heat transfer, fluid dynamics, and phase transitions during UWLW. The results show that UWLW creates a water keyhole, making the welding environment similar to in air laser welding.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Xingrong Lian, Lin Tian, Zengyao Li, Xinpeng Zhao
Summary: This study investigates the heat transfer mechanisms in natural fiber-derived porous structures and finds that thermal radiation has a significant impact on the thermal conductivity in low-density regions, while natural convection rarely occurs. Insulation materials derived from micron-sized natural fibers can achieve minimum thermal conductivity at specific densities. Strategies to lower the thermal conductivity include increasing porosity and incorporating nanoscale pores using nanosize fibers.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Yasir A. Malik, Kilian Koebschall, Stephan Bansmer, Cameron Tropea, Jeanette Hussong, Philippe Villedieu
Summary: Ice crystal icing is a significant hazard in aviation, and accurate modeling of sticking efficiency is essential. In this study, icing wind tunnel experiments were conducted to quantify the volumetric liquid water fraction, sticking efficiency, and maximum thickness of ice layers. Two measurement techniques, calorimetry and capacitive measurements, were used to measure the liquid water content and distribution in the ice layers. The experiments showed that increasing wet bulb temperatures and substrate heat flux significantly increased sticking efficiency and maximum ice layer thickness.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Jinqi Hu, Tongtong Geng, Kun Wang, Yuanhong Fan, Chunhua Min, Hsien Chin Su
Summary: This study experimentally examined the heat dissipation of vibrating fans and demonstrated its inherent mechanism through numerical simulation. The results showed that the flow fields induced by the vibrating blades exhibited pulsating features and formed large-scale and small-scale vortical structures, significantly improving heat dissipation. The study also identified the impacts of different blade structures and developed a trapezoidal-folding blade, which effectively reduced the maximum temperature of the heat source and alleviated high-temperature failure crisis.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Dan-Dan Su, Xiao-Bin Li, Hong-Na Zhang, Feng-Chen Li
Summary: The boiling heat transfer of low-boiling-point working fluid is a common heat dissipation technology in electronic equipment cooling. This study analyzed the interfacial boiling behavior of R134a under different conditions and found that factors such as the initial thickness of the liquid film, solid-liquid interaction force, and initial temperature significantly affect the boiling mode and thermal resistance.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Jinyi Wu, Dongke Sun, Wei Chen, Zhenhua Chai
Summary: A unified lattice Boltzmann-phase field scheme is proposed to simulate dendrite growth of binary alloys in the presence of melt convection. The effects of various factors on the growth are investigated numerically, and the model is validated through comparisons and examinations.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Shaokun Ge, Ya Ni, Fubao Zhou, Wangzhaonan Shen, Jia Li, Fengqi Guo, Bobo Shi
Summary: This study investigated the temperature distribution of main cables in a suspension bridge during fire scenarios and proposed a prediction model for the maximum temperature of cables in different lane fires. The results showed that vehicle fires in the emergency lane posed a greater thermal threat to the cables.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Shuang-Ying Wu, Shi-Yao Zhou, Lan Xiao, Jia Luo
Summary: This paper investigates the two-phase flow and heat transfer characteristics of low-velocity jet impacting on a cylindrical surface. The study reveals that the heat transfer regimes are non-phase transition and nucleate boiling with the increase of heat transfer rate. The effects of jet impact height and outlet velocity on local surface temperatures are pronounced at the non-phase transition stage. The growth rates of heat transfer rate and liquid loss rate increase significantly from the non-phase transition to nucleate boiling stage.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Emad Hasani Malekshah, Wlodzimierz Wlodzimierz, Miros law Majkut
Summary: Cavitation has significant practical importance and can be controlled by air injection. This study investigates the natural to ventilated cavitation process around a hydrofoil through numerical and experimental methods. The results show that the location and rate of air injection have a meaningful impact on the characteristics of cavitation.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Feriel Yahiat, Pascale Bouvier, Antoine Beauvillier, Serge Russeil, Christophe Andre, Daniel Bougeard
Summary: This study explores the enhancement of mixing performance in laminar flow equipment by investigating the generation of chaotic advection using wall deformations in annular geometries. The findings demonstrate that the combined geometry can achieve perfect mixing at various Reynolds numbers.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Hui He, Ning Lyu, Caihua Liang, Feng Wang, Xiaosong Zhang
Summary: This study investigates the condensation, frosting, and defrosting processes on superhydrophobic surfaces with millimeter-scale structures. The results reveal that the structures can influence the growth and removal of frost crystals, with the bottom grooves creating a frost-free zone and conical edges promoting higher frost crystal heights. Two effective methods for defrosting are observed: hand-lifting the groove and airfoil retraction contraction on protruding structures. This research provides valuable insights into frost formation and defrosting on millimeter-structured superhydrophobic surfaces, with potential applications in anti-frost engineering.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Thiwanka Arepolage, Christophe Verdy, Thibaut Sylvestre, Aymeric Leray, Sebastien Euphrasie
Summary: This study developed two thermal concentrators, one with a 2D design of uniform thickness and another with a 3D design, using the coordinate transformation technique and metamaterials. By structuring the thermal conductor, the desired local density-heat capacity product and anisotropic thermal conductivities were achieved. The homogenized thermal conductivities were obtained from finite element simulations and cylindrical symmetry consideration. A 3D concentrator was fabricated using 3D metal printing and characterized using a thermal camera. Compared to devices that solely consider anisotropic conductivities, the time evolution characteristics of the metadevice designed with coordinate transformation were closer to those of an ideal concentrator.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Liangyuan Cheng, Qingyang Wang, Jinliang Xu
Summary: In this study, we investigated the supercritical heat transfer of CO2 in a horizontal tube with a diameter of 10.0 mm, covering a wide range of pressures, mass fluxes, and heat fluxes. The study revealed a non-monotonic increase in wall temperatures along the flow direction and observed both positive and negative wall temperature differences between the bottom and top tube. The findings were explained by the thermal conduction in the solid wall interacting with the stratified-wavy flow in the tube.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)